<?xml version='1.0'?><?xml-stylesheet href='/static/xsl/oai.xsl' type='text/xsl'?><ri:Resource created="2026-04-09T08:30:00Z" status="active" updated="2026-04-10T15:23:43" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/RegistryInterface/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/RegistryInterface-v1.0.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource-v1.1.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService-v1.1.xsd" xsi:type="vs:CatalogResource"><title>Apertif DR-2</title><identifier>ivo://astron.nl/apertif_dr2/q/calibrated_visibilities</identifier><curation><publisher>ASTRON</publisher><creator><name>Apertif Team</name></creator><date role="updated">2026-04-10T15:23:43</date><contact><name>Michael Sipior</name><address>Oude Hoogeveensedijk 4, 7991PD Dwingeloo, the Netherlands</address><email>vo@astron.nl</email></contact></curation><content><subject>HI line</subject><subject>radio</subject><source format="bibcode">2022A&amp;A...667A..38A</source><referenceURL>https://vo.astron.nl/tableinfo/apertif_dr2.calibrated_visibilities</referenceURL><type>Survey</type><contentLevel>Research</contentLevel></content><facility>WSRT</facility><instrument>Apertif</instrument><coverage><waveband>Radio</waveband></coverage><tableset><schema><name>apertif_dr2</name><title>Apertif DR-2</title><table><name>apertif_dr2.calibrated_visibilities</name><column><name>target</name><ucd>meta.id</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ra</name><unit>deg</unit><ucd>pos.eq.ra;meta.main</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>indexed</flag><flag>nullable</flag></column><column><name>dec</name><unit>deg</unit><ucd>pos.eq.dec;meta.main</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>indexed</flag><flag>nullable</flag></column><column><name>beam</name><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>fov</name><unit>deg</unit><ucd>phys.angSize;instr.fov</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>central_frequency</name><unit>MHz</unit><ucd>em.frequency</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>n_channels</name><ucd>meta.number</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>bandwidth</name><unit>MHz</unit><ucd>em.frequency</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>t_min</name><ucd>time.start;obs.exposure</ucd><dataType arraysize="19" extendedType="timestamp" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>t_max</name><ucd>time.end;obs.exposure</ucd><dataType arraysize="19" extendedType="timestamp" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>duration</name><unit>h</unit><ucd>time.duration;obs.exposure</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>task_id</name><ucd>meta.id</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>obsid</name><ucd>meta.id</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>dataproduct_type</name><ucd>meta.id</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>dataproduct_subtype</name><ucd>meta.id</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>product_key</name><ucd>meta.id</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>equinox</name><ucd>meta.text</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>quality</name><ucd>meta.id</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>pub_did</name><description>Dataset identifier assigned by the publisher</description><ucd>meta.id;meta.main</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>accref</name><description>Access url for the data</description><utype>Access.Reference</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column></table></schema></tableset></ri:Resource>